JP2802075B2 - Creating a masking pattern - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a masking film for plate making and a method for forming a masking pattern.

[Prior Art and Problems to be Solved by the Invention] As shown in FIG. 4, a conventional masking film 6 used for preparing an original for plate making includes a transparent plastic film, a support 5 mainly made of a polyester film. Actinic ray shielding masking film 4 that can be peeled off on one side
Are provided, and there are a non-photosensitive type and a photosensitive type. The pattern can be created by inserting a cutting line 8 into the masking film 4 with a tool having a sharp tip such as a knife, and peeling off the film inside or outside the portion surrounded by the cutting line 8, or a concatenated line manuscript. A cutting line is formed by a photographic method from, and peeling is performed.

In recent years, with the spread of automatic cutting systems using CAD systems, the cutting speed of complex patterns has increased, but since the peeling is a manual operation, the part 4 'where the masking film is peeled off using a knife etc. along the cutting line. It takes a long time to lift and remove the masking film 4 'from the surrounding support 5 by using a finger, and an unbalance between the cutting and the peeling work time becomes a problem, and it is desired to shorten the peeling work time. Was.

The reason for the time required for the stripping operation is that the masking film 4 is very thin, about 20 to 40 μm, and the knife 9 or the like easily reaches the surface of the polyester film 5. This is because it is necessary to work carefully so as not to damage the film surface. Even with careful attention, the masking film 4 of the pattern to be left is often scratched, and it takes time to correct these.

Further, if the peeled masking film 4 'has re-adhesive properties, it may adhere to the fingertips and the surface of the masking film 4, which may be a defect of the masking document. Met.

As described above, there has been a demand for improvements in the working speed, the peeling method, and the like in the conventional masking film and its pattern formation.

In addition, a peel-off film which is also used as an original mounting sheet for making a copy is known (JP-A-57-124351). In this film, an adhesive layer and a mask layer are provided on a transparent base film, and a photo manuscript or the like is stuck at the position of the peeled mask layer. However, there is the same difficulty as above in peeling the mask layer. Was.

[Object of the Invention] The present invention has been made to solve the above problems,
To provide a masking film for plate making and a method of making a masking pattern, which can reduce the time required for the peeling operation, do not damage the surface of the masking film made of a plastic film such as polyester, and can prevent the re-adhesion of the peeled masking film. With the goal.

[Means for Solving the Problems] In order to achieve the above object, a masking pattern forming method according to the present invention comprises bonding an actinic ray-shielding masking film to a support, and bonding the masking film surface to the masking film by heat. A cutting line is inserted into the masking film from the surface of the adhesive layer of the masking film, which is provided with a heat-sensitive type or a pressure-sensitive type adhesive layer which exhibits adhesiveness by pressure. The masking film containing the cutting line of the masking film is placed on the adhesive layer of the film, by heating or pressing a portion to be peeled off from the surface of the peeling sheet, and peeling the peeling sheet. It is characterized by being partially removed. In addition, using a transparent release sheet and the above-described masking film, the masking film removed from the masking film by the above-described masking pattern forming method and adhered to the transparent release sheet side together with the adhesive layer is subjected to a Yin-Yang relationship. And the other masking pattern.

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1 (a), a masking film 1 of the present invention has a masking film 4 adhered to a support 5 and a heat-sensitive adhesive layer 2 provided on the masking film 4 surface. A release sheet 3 is placed on the heat-sensitive adhesive layer 2 and used.

A known masking film (conventional masking film 6) is suitable for a transparent plastic film, a support 5 mainly composed of a polyester film, provided with a peelable actinic light-shielding masking film 4 on one side of the polyester. (JP-B-51-25478, JP-B-5-5478)
8-46011, JP-A-59-123841, JP-A-61-1
No. 143758). The adhesive layer 2 provided on the masking film 4 may be a heat-sensitive polyamide-based, polyester-based, or rubber-based hot melt adhesive, or a pressure-sensitive adhesive such as a rubber-based, acrylic-based, vinyl-based, or silicon-based adhesive. A system-based pressure-sensitive adhesive is suitable, but not limited thereto. The thickness of the adhesive layer is preferably 3 to 50 μm.

When the adhesive layer 2 is applied and dried on the surface of the masking film 4, a fine powder insoluble in a solvent can be added in order to prevent the film surface from exhibiting strong tackiness at normal temperature.

In the case of an adhesive that melts by heat, it can be applied on a masking film by a hot melt coater.

The plastic film as the release sheet 3 is a polymer compound having flexibility, and is made of polyester (for example, polyethylene terephthalate, polycarbonate),
Polyamide, polyolefin (for example, polypropylene,
Synthetic resins such as polyvinyl chloride, polystyrene, polymethyl methacrylate, and copolymers thereof, and cellulose derivatives (eg, diacetyl cellulose, triacetyl cellulose, propyl cellulose, mixed cellulose esters) are preferred. The release sheet 3 is transparent or translucent so that the cutting line 8 can be seen when placed on the adhesive layer 2 of the masking film 1.

The release sheet 3 is a masking film 1 laid flat.
It only needs to be thick enough not to break when peeled from
10-200μ is preferred.

The masking pattern forming method of the present invention using the masking film and the release sheet having the above-described configurations,
It is as follows.

As shown in FIG. 2, the adhesive layer 2 of the masking film 1 in which the cutting line 8 is inserted from the surface of the adhesive layer 2 to the masking film 4 is combined with the release sheet 3, and from the surface of the release sheet 3. Then, one or several end portions of the portion 4 'to be peeled are gently pressed using a trowel 7 heated to a desired temperature (if the adhesive layer 2 is of a pressure-sensitive type, heating is not necessary).

Subsequently, as shown in FIG. 3, when the peeling sheet 3 is peeled off from the masking film 1, the portion 4 ′ of the masking film to be peeled is quickly moved from the support 5 of the masking film 1 to the peeling sheet 3 side. By peeling off, a desired pattern can be obtained on the masking film 1 (third pattern).
Left part of the figure).

Another masking pattern forming method is to use a transparent peeling sheet 3 and use the masking film 4 'peeled off on the peeling sheet 3 side by the above method as the other masking pattern in a positive / negative relationship. Since the masking pattern is formed once, both the positive and negative masking patterns can be obtained on the masking film 1 side and the release sheet 3 side at the same time, so that both accurate positive and negative masking patterns can be obtained.

EXAMPLES Next, the present invention will be described in detail with reference to specific examples.

Comparative Example A known masking film for plate making (commercially available bandel coat: manufactured by Kimoto Co., Ltd.) 6 was provided with a cutting line so that 100 squares of 1 cm square were included in 10 cm square.
One portion of each of the grids was scooped up using a cutter knife so that the masking pattern became a checkerboard pattern, and peeled off.

When this peeling operation was repeated 10 times, the required time per operation was 3 minutes and 2 seconds.

Example 1 A masking film was obtained as follows.

A known masking film for plate making (trade name Vander Coat: manufactured by Kimoto Co., Ltd.) 6
Polycaprolactone having an average molecular weight of 10,000 is applied by a hot melt roll coater to form an adhesive layer 2 having a thickness of 20 μm.
Was obtained.

Next, the adhesive layer 2 and the masking film 4 of the masking film 1 are provided with a 1 cm square grid within a 10 cm square.
A cutting line was inserted from the adhesive layer 2 so as to form individual pieces, and a 25 μm-thick polyethylene terephthalate film as a release sheet 3 was superposed on the surface of the adhesive layer 2.

After gently pressing one part of each grid to be peeled from the back of the peeling sheet 3 with a trowel 7 (pen having an iron tip) heated to 80 to 100 ° C. so that the masking pattern becomes a checkered pattern. When the release sheet 3 was released,
A checkered masking pattern was obtained at once.

When this peeling operation was repeated 10 times, the required time per operation was 45 seconds, and the operation could be performed at about four times the speed of 3 minutes 2 seconds of the comparative example. Moreover, the support 5 and the masking film 4 of the masking film 6 were not damaged at all, and there was no re-adhesion of the masking film.

Example 2 A masking film was obtained as follows.

As shown in FIG. 1 (b), a toluene solution of polycaprolactone having an average molecular weight of 10,000 was applied to one surface of a stretched polypropylene film 21 having a thickness of 20 μm and dried to obtain a film 22 having an adhesive layer 2 having a thickness of 10 μm. Was.

Next, as shown in FIGS. 1 (c) and 1 (d), the surface of the adhesive layer 2 of the film 22 is coated with a masking film 4 of a well-known masking film for plate making (trade name: Vandelcoat: manufactured by Kimoto Co., Ltd.). After thermocompression bonding with a 100 ° C heat laminator and cooling, the stretched polypropylene film
21 was peeled off to obtain a masking film 1 having an adhesive layer 2.

Next, the adhesive layer 2 and the masking film 4 of the masking film 1 are provided with a 1 cm square grid within a 10 cm square.
A cutting line was inserted from the adhesive layer 2 so as to form individual pieces, and a 25 μm-thick polyethylene terephthalate film as a release sheet 3 was superposed on the surface of the adhesive layer 2.

After gently pressing one part of each grid to be peeled from the back of the peeling sheet 3 with a trowel 7 (pen having an iron tip) heated to 80 to 100 ° C. so that the masking pattern becomes a checkered pattern. When the release sheet 3 was released,
A checkered masking pattern was obtained at once.

When this peeling operation was repeated 10 times, the required time per operation was 45 seconds as in Example 1, and the operation could be performed at about 4 times as fast as 3 minutes 2 seconds of the comparative example. Moreover, the support 5 and the masking film 4 of the masking film 6 were not damaged at all, and there was no re-adhesion of the masking film.

Example 3 A masking film was obtained as follows.

In a masking film 4 of a well-known masking film for plate making (trade name: Van der Coat: manufactured by Kimoto Co., Ltd.), 20 g of Hirodine 120 (trade name: manufactured by Hirodine Industry Co., Ltd.) is dissolved in 10 g of toluene. The solution thus obtained was applied and dried to obtain a masking film 1 having an adhesive layer 2 having a thickness of 10 μm.

Next, the adhesive layer 2 and the masking film 4 of the masking film 1 are provided with a 1 cm square grid within a 10 cm square.
A cutting line was inserted from the adhesive layer 2 so as to form individual pieces, and a 25 μm-thick polyethylene terephthalate film as a release sheet 3 was placed on the surface of the adhesive layer 2.

After gently pressing one part of each grid to be peeled from the back of the peeling sheet 3 with the iron 7 (pen having the tip of iron) heated to 100 to 120 ° C. so that the masking pattern becomes a checkered pattern. When the release sheet 3 was released,
A checkered masking pattern was obtained at once.

When this peeling operation was repeated 10 times, the required time per operation was 47 seconds, and the operation could be performed at about four times the speed of 3 minutes 2 seconds of the comparative example. Moreover, the support 5 and the masking film 4 of the masking film 6 were not damaged at all, and there was no re-adhesion of the masking film.

[Effects of the Invention] As is clear from the above description, the masking film for plate making according to the present invention is obtained by adhering a masking film having an actinic ray-shielding property to a support, and forming a cutting line on the masking film surface. An adhesive for adhering and removing the masking film surface to another member, characterized in that a heat-sensitive adhesive that exhibits adhesiveness by heat or a pressure-sensitive adhesive layer that exhibits adhesiveness by pressure is provided. Further, the masking pattern forming method according to the present invention, the above-mentioned masking film, a cutting line is inserted into the masking film from the adhesive layer surface, a release sheet is superimposed on the adhesive layer of the masking film, By heating or pressurizing the part to be peeled from the peeling sheet surface, and after bonding both surfaces, by peeling the peeling sheet, It is characterized by partially removing the masking film in which the cutting line of the masking film is put, and is also removed from the masking film by the masking pattern forming method using a transparent release sheet and the masking film as described above. The masking film attached to the transparent peeling sheet side together with the adhesive layer is used as the other masking pattern in the yin-yang relationship, so that the peeling operation time is reduced and the masking made of a plastic film such as polyester is used. Without damaging the film surface, it is possible to prevent re-adhesion of the peeled film, and it is also possible to make the peeled masking film into one of the masking patterns in the positive and negative relations. Both masking patterns on the seat side Because it is completely accurate inner and outer masks are advantageous obtained.

[Brief description of the drawings]

1 (a), 1 (b), 1 (c) and 1 (d) show the configuration of a masking film for plate making of the present invention, and FIGS. 2 and 3 show masking patterns using the masking film of the present invention. FIG. 4 is a diagram showing a creating method, and FIG. 4 is a diagram showing a conventional masking pattern creating method. DESCRIPTION OF SYMBOLS 1 ... Masking film 2 ... Adhesive layer 21 ... Stretched polypropylene film 22 ... Film with adhesive layer 3 ... Peeling sheet 4 ... Masking film 4 '... Part where masking film peels 5 ... Support Body 6: Conventional masking film 7: Iron 8: Cutting line 9: Cutter

Claims (2)

(57) [Claims] 1. An actinic light-shielding masking film is adhered to a support, and a heat-sensitive adhesive layer exhibiting adhesiveness by heat or a pressure-sensitive adhesive layer exhibiting adhesiveness by pressure is provided on the masking film surface. Of a masking film characterized by
A cutting line is inserted into the masking film from the adhesive layer surface, a release sheet is placed on the adhesive layer of the masking film, and a portion to be peeled from the release sheet surface is heated or pressed, and A masking pattern forming method, wherein a masking film in which the cutting line of the masking film is put is partially removed by peeling a sheet. 2. An actinic light-shielding masking film is adhered to a support, and a heat-sensitive adhesive layer exhibiting adhesiveness by heat or a pressure-sensitive adhesive layer exhibiting adhesiveness by pressure is provided on the masking film surface. Of a masking film characterized by
A cutting line is inserted into the masking film from the adhesive layer surface, a transparent release sheet is placed on the adhesive layer of the masking film, and a portion to be released from the release sheet surface is heated or pressed, and By peeling off the release sheet, the masking film is removed from the masking film by a masking pattern forming method characterized by partially removing the masking film containing the cutting line of the masking film, and the release sheet side A masking pattern forming method, characterized in that a masking film adhered to the substrate together with an adhesive layer is used as a masking pattern.